linux-kernel - Re: [PATCH] kexec: Add prefix "kexec" to output message

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Date:	Mon, 14 Sep 2015 16:44:00 +0800
From:	Dave Young <dyoung@...hat.com>
To:	Minfei Huang <mnfhuang@...il.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	akpm@...ux-foundation.org, kexec@...ts.infradead.org,
	linux-kernel@...r.kernel.org, mhuang@...hat.com
Subject: Re: [PATCH] kexec: Add prefix "kexec" to output message

On 09/14/15 at 03:50pm, Minfei Huang wrote:
> On 09/13/15 at 11:52am, Eric W. Biederman wrote:
> > Minfei Huang <mnfhuang@...il.com> writes:
> > 
> > > kexec output message misses the prefix "kexec", when Dave Young split
> > > the kexec code. To keep the same format, add the prefix "kexec" to
> > > output message.
> > 
> > What of kexec_core? What of the messages that already have a prefix?
> > 
> 
> Hi, Eric.
> 
> Last commit(2965fa), Dave Young (dyoung@...hatcom) split the previous
> kernel/kexec.c into three pieces(kexec_core.c, kexec_file.c, kexec.c).
> The common functions used by both kexec and kexec_file are placed in
> file kernel/kexec_core.c.
> 
> The format of the output message likes "kexec: SYSC_kexec_load: hello,
> world" previously. Due to the missing prefix "kexec", now it like
> "SYSC_kexec_load: hello, world".
> 
> Dave Young misses the Macro pr_fmt to define the prefix output message
> in file kexec.c and kexec_file.c. I think the previous Macro was moved
> into the file kexec_core.c when Dave did the splitting.

I'm not sure it is proper to add prefix "kexec: " in all kexec*.c, so
only keep it in kexec_core.c.

There's already printks with prefix like "Kexec:", "crashkernel:" and
other strings. Adding another prefix before them looks odd. So either remove 
the prefix in kexec_core, or remove other prefixes already exists in kexec*.c
I would prefix to remove the "kexec:" prefix in kexec_core.c

> 
> Thanks
> Minfei
> 
> > > Following is the format of output message now.
> > > [  140.290795] SYSC_kexec_load: hello, world
> > >
> > > Ideally, the format of output message likes below.
> > > [  140.291534] kexec: sanity_check_segment_list: hello, world
> > >
> > > Signed-off-by: Minfei Huang <mnfhuang@...il.com>
> > > ---
> > >  kernel/kexec.c      | 2 ++
> > >  kernel/kexec_file.c | 2 ++
> > >  2 files changed, 4 insertions(+)
> > >
> > > diff --git a/kernel/kexec.c b/kernel/kexec.c
> > > index 4c5edc3..15351ba 100644
> > > --- a/kernel/kexec.c
> > > +++ b/kernel/kexec.c
> > > @@ -6,6 +6,8 @@
> > >   * Version 2.  See the file COPYING for more details.
> > >   */
> > >  
> > > +#define pr_fmt(fmt)	"kexec: " fmt
> > > +
> > >  #include <linux/capability.h>
> > >  #include <linux/mm.h>
> > >  #include <linux/file.h>
> > > diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
> > > index 6a9a3f2..b1ad01b 100644
> > > --- a/kernel/kexec_file.c
> > > +++ b/kernel/kexec_file.c
> > > @@ -9,6 +9,8 @@
> > >   * Version 2.  See the file COPYING for more details.
> > >   */
> > >  
> > > +#define pr_fmt(fmt)	"kexec: " fmt
> > > +
> > >  #include <linux/capability.h>
> > >  #include <linux/mm.h>
> > >  #include <linux/file.h>
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